Voltage Controlled Oscillator
Built
VCO
Version 1.0
About
My voltage controlled oscillator is based on Mortiz Klein’s designs for a VCO combined with the saw wave to triangle wave converter that he uses as part of his wavefolder.
The core of the oscillator is based around a 40106 Schmidt Trigger Inverter. Linear to exponential conversion of the control voltage is performed by a BC548 transistor. The oscillator has an FM input which is attenuated by a potentiometer on the face plate to add some noise, and the width of the pulse output is also voltage controlled and adjustable with a potentiometer.
Format
8HP
Width
Inputs & Outputs
| Name | Signal type | Notes | |
|---|---|---|---|
| In | 1V/OCT | 1 Volt per Octave | Pitch |
| In | FM CV | Control Voltage | Frequency Modulation Input |
| In | PWM CV | Control Voltage | Pulse Width Modulation Input |
| Out | PULSE | Audio | Pulse Output |
| Out | SAW | Audio | Saw Output |
| Out | TRIANGLE | Audio | Triangle Output |
Future improvements
- If I redesign this VCO, I would like to add a sine converter to get sine wave output from the module.